Quarkonium annihilation rates
- 1. Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637
Description
Recent measurements of ratios of quarkonium annihilation rates are used to evaluate the strong fine-structure constant α/sub s/. Expressions are presented for QCD radiative corrections with α/sub s/ referred to the quark-mass scale. We find α/sub s/(m/sub b/) = 0.179/sub -0.008//sup +0.009/ from the ratio Γ(Υ→γgg) Γ(Υ→ggg). The corresponding range of Λ/sub MS//sub $-bar//sub <(4)/ (the QCD scale factor for four light-quark flavors) is 146--210 MeV, where MS-bar denotes the modified-minimal-subtraction scheme. The experimentally more precise but theoretically more questionable ratio of the gluonic and muonic widths of Jpsi and Υ yields α/sub s/(m/sub c/) = 0.29 +- 0.02, α/sub s/(m/sub b/) = 0.189 +- 0.008 when v2c2 corrections to these ratios for Jpsi and Υ are parametrized linearly. Further predictions are made for ratios of rates
Additional details
Publishing Information
- Journal Title
- Phys. Rev., D
- Journal Volume
- 37
- Journal Issue
- 11
- Series
- Phys. Rev., D.
- Journal Page Range
- 3210-3215
- ISSN
- 0556-2821
- CODEN
- PRVDA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 19074798
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Descriptors DEI
- ANNIHILATION; BOTTOMONIUM; DECAY; ENERGY LEVELS; FINE STRUCTURE; FLAVOR MODEL; GLUONS; MUONS; PARITY; QUANTUM CHROMODYNAMICS; QUARKONIUM; RADIATIVE CORRECTIONS; S WAVES; SPIN
- Descriptors DEC
- ANGULAR MOMENTUM; BOSONS; COMPOSITE MODELS; CORRECTIONS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; HADRONS; INTERACTIONS; LEPTONS; MATHEMATICAL MODELS; MESONS; PARTIAL WAVES; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARK MODEL